摘要:
The invention concerns a method for arc-welding of at least a metal workpiece (1) on a matrix (2) comprising at least a brazed zone (3) whereof the brazing contains copper and phosphorus, which comprises the following steps: (a) producing on at least part of the brazed zone (3), a deposition of at least a layer (5, 6, 7) of pure copper or of a copper alloy for which the phosphorus solubility limit is between about 0.1 and 3.5 % at solidification temperature; and (b) welding the metal workpiece (1) on said at least one copper layer (5, 6, 7) deposited in step (a). The invention also concerns a method for making a brazed heat exchanger using such a welding process. The invention further concerns the resulting heat exchangers and their use in cryogenic gas separation, in particular air separation in a cryogenic separating unit.
摘要:
The invention concerns a plasma-forming gas consisting of a ternary mixture of helium, argon and hydrogen characterised in that it contains 3 to 20 % by volume of helium, 16 to 24 % by volume of hydrogen, the remainder being argon. Said gas mixture is particularly adapted for use in plasma spraying of refractory or metal powders, in particular for producing adhesive undercoats, for protection against oxidation or wear.
摘要:
A burner apparatus comprises a conduit (40) adapted to convey preheated oxidant and having outlet and inlet ends, and a conduit adapted to convey preheated fuel and having outlet and inlet ends. The conduit (36) adapted to convey preheated fuel is substantially parallel and positioned substantially vertically above the conduit (36) adapted to convey preheated fuel. The conduit (36, 40) adapted to convey preheated oxidant and preheated fuel each are positioned within its own respective elongate cavity (10, 31) in a refractory burner block (4). Such that a substantially annular region is present between an outer surface of each conduit and its respective cavity. Each conduit inlet (46, 48) end extends through a respective plenum (37, 47) for receiving an ambient temperature fluid, the plenums (37, 47) adapted to pass the ambient temperature fluid into the respective annular regions.
摘要:
The invention relates to a method for conditioning a receptacle which can contain a pressurized liquid, e.g. a gas cylinder, whereby said receptacle is fitted with a positive pressure valve into which a gas with a water or water vapour content of less than 40ppmv is introduced after the internal volume, i.e. the inside, of the receptacle has been dried in order to remove any water vapour therein. A receptacle conditioned in such a way can be used in a welding operation, especially TIG, MIG or MAG welding, or in a plasma-arc cutting operation.
摘要:
The reservoir (1) of the device supports a shaped collar (8) in its upper part, this collar forming a means of handling the device and a channel for collecting and draining condensed water from the vaporising coil (5) via an opening (11). Typically, said coil has turns of increasing diameters and is supported on the channel (8) by support combs (13) and enclosed in a cover (4). Said cover (4) is provided with peripheral (16) and upper (17) aeration openings and comprises means (19) for engaging with a container (20) for collecting the condensates directly by force of gravity. The invention is particularly suitable for home oxygenotherapy.
摘要:
The invention concerns a novel method (and its associated device) for regulated injection of liquid carbon dioxide (CO2L) in a pressurised liquid (L) inside a chamber. The invention is characterised in that said liquid carbon dioxide (CO2L) is injected at a fixed timed flow rate protected by a gas stream (whenever the injection stops).
摘要:
The invention concerns a device for storing articles under controlled atmosphere comprising at least a storing module (X, Y, Z...) capable of receiving the articles to be stored, module with a substantially parallelepiped shape and having two substantially vertical opposite walls (PX1, PY2), and means (5, 7) for setting said storage atmosphere inside said at least one module, the means for setting the atmosphere being capable of causing a substantially lateral and laminar circulation of the gas from one of the substantially vertical walls towards the other wall opposite thereto.
摘要:
The invention concerns a fuel mixture containing acetylene, propane and propylene, such that the ratio Qp/Qa of the proportion (Qp) of propane and propylene to the proportion (Qa) of acetylene is such that: 1.1≤Qp/Qa≤4. Preferably, the propane/propylene proportion in the gas mixture ranges between 50:50 and 99:1. Advantageously, the gas mixture contains 15 % to 50 % by volume of acetylene, the remainder being propane and propylene. The invention is applicable to a fuel mixture for oxyacetylene cutting of metals, the fuel mixture being produced on the site of operation, in particular in a gas mixer.
摘要:
Catering service trolleys for preserving and distributing meal service trays in aeroplanes. Said trolley comprises side walls (28, 30) with double shells defining vertical channels (34) opening at their upper part into the housing (22) containing the refrigerating agent and at their lower part in the proximity of the bottom of the section (26) receiving the meal-trays, thus enabling the refrigerating gas to circulate by convection over the whole height of the trolley and a more homogeneous temperature distribution.
摘要:
The inventive fuel cell pack (2) is integrated in a power producing device and comprises a series of elementary cells (32) and fluid distribution means which makes it possible to feed each cell with two different fluids and remove said two different fluids from the cells and are connectable to a fluid distribution system (6, 8, 14, 16, 18, 20, 22). Said fuel cell pack is provided with first check valve elements linked with fluid distribution means which interacts with second valve elements (241-244) with which the entire fluid distribution system is provided.